1 /*
2 Simple DirectMedia Layer
3 Copyright (C) 1997-2016 Sam Lantinga <slouken@libsdl.org>
4
5 This software is provided 'as-is', without any express or implied
6 warranty. In no event will the authors be held liable for any damages
7 arising from the use of this software.
8
9 Permission is granted to anyone to use this software for any purpose,
10 including commercial applications, and to alter it and redistribute it
11 freely, subject to the following restrictions:
12
13 1. The origin of this software must not be misrepresented; you must not
14 claim that you wrote the original software. If you use this software
15 in a product, an acknowledgment in the product documentation would be
16 appreciated but is not required.
17 2. Altered source versions must be plainly marked as such, and must not be
18 misrepresented as being the original software.
19 3. This notice may not be removed or altered from any source distribution.
20 */
21 #include "../../SDL_internal.h"
22
23 #if SDL_JOYSTICK_PSP
24
25 /* This is the PSP implementation of the SDL joystick API */
26 #include <pspctrl.h>
27 #include <pspkernel.h>
28
29 #include <stdio.h> /* For the definition of NULL */
30 #include <stdlib.h>
31
32 #include "../SDL_sysjoystick.h"
33 #include "../SDL_joystick_c.h"
34
35 #include "SDL_events.h"
36 #include "SDL_error.h"
37 #include "SDL_mutex.h"
38 #include "SDL_timer.h"
39 #include "../../thread/SDL_systhread.h"
40
41 /* Current pad state */
42 static SceCtrlData pad = { .Lx = 0, .Ly = 0, .Buttons = 0 };
43 static SDL_sem *pad_sem = NULL;
44 static SDL_Thread *thread = NULL;
45 static int running = 0;
46 static const enum PspCtrlButtons button_map[] = {
47 PSP_CTRL_TRIANGLE, PSP_CTRL_CIRCLE, PSP_CTRL_CROSS, PSP_CTRL_SQUARE,
48 PSP_CTRL_LTRIGGER, PSP_CTRL_RTRIGGER,
49 PSP_CTRL_DOWN, PSP_CTRL_LEFT, PSP_CTRL_UP, PSP_CTRL_RIGHT,
50 PSP_CTRL_SELECT, PSP_CTRL_START, PSP_CTRL_HOME, PSP_CTRL_HOLD };
51 static int analog_map[256]; /* Map analog inputs to -32768 -> 32767 */
52
53 typedef struct
54 {
55 int x;
56 int y;
57 } point;
58
59 /* 4 points define the bezier-curve. */
60 static point a = { 0, 0 };
61 static point b = { 50, 0 };
62 static point c = { 78, 32767 };
63 static point d = { 128, 32767 };
64
65 /* simple linear interpolation between two points */
lerp(point * dest,point * a,point * b,float t)66 static SDL_INLINE void lerp (point *dest, point *a, point *b, float t)
67 {
68 dest->x = a->x + (b->x - a->x)*t;
69 dest->y = a->y + (b->y - a->y)*t;
70 }
71
72 /* evaluate a point on a bezier-curve. t goes from 0 to 1.0 */
calc_bezier_y(float t)73 static int calc_bezier_y(float t)
74 {
75 point ab, bc, cd, abbc, bccd, dest;
76 lerp (&ab, &a, &b, t); /* point between a and b */
77 lerp (&bc, &b, &c, t); /* point between b and c */
78 lerp (&cd, &c, &d, t); /* point between c and d */
79 lerp (&abbc, &ab, &bc, t); /* point between ab and bc */
80 lerp (&bccd, &bc, &cd, t); /* point between bc and cd */
81 lerp (&dest, &abbc, &bccd, t); /* point on the bezier-curve */
82 return dest.y;
83 }
84
85 /*
86 * Collect pad data about once per frame
87 */
JoystickUpdate(void * data)88 int JoystickUpdate(void *data)
89 {
90 while (running) {
91 SDL_SemWait(pad_sem);
92 sceCtrlPeekBufferPositive(&pad, 1);
93 SDL_SemPost(pad_sem);
94 /* Delay 1/60th of a second */
95 sceKernelDelayThread(1000000 / 60);
96 }
97 return 0;
98 }
99
100
101
102 /* Function to scan the system for joysticks.
103 * Joystick 0 should be the system default joystick.
104 * It should return number of joysticks, or -1 on an unrecoverable fatal error.
105 */
SDL_SYS_JoystickInit(void)106 int SDL_SYS_JoystickInit(void)
107 {
108 int i;
109
110 /* Setup input */
111 sceCtrlSetSamplingCycle(0);
112 sceCtrlSetSamplingMode(PSP_CTRL_MODE_ANALOG);
113
114 /* Start thread to read data */
115 if((pad_sem = SDL_CreateSemaphore(1)) == NULL) {
116 return SDL_SetError("Can't create input semaphore");
117 }
118 running = 1;
119 if((thread = SDL_CreateThreadInternal(JoystickUpdate, "JoystickThread", 4096, NULL)) == NULL) {
120 return SDL_SetError("Can't create input thread");
121 }
122
123 /* Create an accurate map from analog inputs (0 to 255)
124 to SDL joystick positions (-32768 to 32767) */
125 for (i = 0; i < 128; i++)
126 {
127 float t = (float)i/127.0f;
128 analog_map[i+128] = calc_bezier_y(t);
129 analog_map[127-i] = -1 * analog_map[i+128];
130 }
131
132 return 1;
133 }
134
SDL_SYS_NumJoysticks()135 int SDL_SYS_NumJoysticks()
136 {
137 return 1;
138 }
139
SDL_SYS_JoystickDetect()140 void SDL_SYS_JoystickDetect()
141 {
142 }
143
144 /* Function to get the device-dependent name of a joystick */
SDL_SYS_JoystickNameForDeviceIndex(int device_index)145 const char * SDL_SYS_JoystickNameForDeviceIndex(int device_index)
146 {
147 return "PSP builtin joypad";
148 }
149
150 /* Function to perform the mapping from device index to the instance id for this index */
SDL_SYS_GetInstanceIdOfDeviceIndex(int device_index)151 SDL_JoystickID SDL_SYS_GetInstanceIdOfDeviceIndex(int device_index)
152 {
153 return device_index;
154 }
155
156 /* Function to get the device-dependent name of a joystick */
SDL_SYS_JoystickName(int index)157 const char *SDL_SYS_JoystickName(int index)
158 {
159 if (index == 0)
160 return "PSP controller";
161
162 SDL_SetError("No joystick available with that index");
163 return(NULL);
164 }
165
166 /* Function to open a joystick for use.
167 The joystick to open is specified by the device index.
168 This should fill the nbuttons and naxes fields of the joystick structure.
169 It returns 0, or -1 if there is an error.
170 */
SDL_SYS_JoystickOpen(SDL_Joystick * joystick,int device_index)171 int SDL_SYS_JoystickOpen(SDL_Joystick *joystick, int device_index)
172 {
173 joystick->nbuttons = 14;
174 joystick->naxes = 2;
175 joystick->nhats = 0;
176
177 return 0;
178 }
179
180 /* Function to determine if this joystick is attached to the system right now */
SDL_SYS_JoystickAttached(SDL_Joystick * joystick)181 SDL_bool SDL_SYS_JoystickAttached(SDL_Joystick *joystick)
182 {
183 return SDL_TRUE;
184 }
185
186 /* Function to update the state of a joystick - called as a device poll.
187 * This function shouldn't update the joystick structure directly,
188 * but instead should call SDL_PrivateJoystick*() to deliver events
189 * and update joystick device state.
190 */
SDL_SYS_JoystickUpdate(SDL_Joystick * joystick)191 void SDL_SYS_JoystickUpdate(SDL_Joystick *joystick)
192 {
193 int i;
194 enum PspCtrlButtons buttons;
195 enum PspCtrlButtons changed;
196 unsigned char x, y;
197 static enum PspCtrlButtons old_buttons = 0;
198 static unsigned char old_x = 0, old_y = 0;
199
200 SDL_SemWait(pad_sem);
201 buttons = pad.Buttons;
202 x = pad.Lx;
203 y = pad.Ly;
204 SDL_SemPost(pad_sem);
205
206 /* Axes */
207 if(old_x != x) {
208 SDL_PrivateJoystickAxis(joystick, 0, analog_map[x]);
209 old_x = x;
210 }
211 if(old_y != y) {
212 SDL_PrivateJoystickAxis(joystick, 1, analog_map[y]);
213 old_y = y;
214 }
215
216 /* Buttons */
217 changed = old_buttons ^ buttons;
218 old_buttons = buttons;
219 if(changed) {
220 for(i=0; i<sizeof(button_map)/sizeof(button_map[0]); i++) {
221 if(changed & button_map[i]) {
222 SDL_PrivateJoystickButton(
223 joystick, i,
224 (buttons & button_map[i]) ?
225 SDL_PRESSED : SDL_RELEASED);
226 }
227 }
228 }
229
230 sceKernelDelayThread(0);
231 }
232
233 /* Function to close a joystick after use */
SDL_SYS_JoystickClose(SDL_Joystick * joystick)234 void SDL_SYS_JoystickClose(SDL_Joystick *joystick)
235 {
236 }
237
238 /* Function to perform any system-specific joystick related cleanup */
SDL_SYS_JoystickQuit(void)239 void SDL_SYS_JoystickQuit(void)
240 {
241 /* Cleanup Threads and Semaphore. */
242 running = 0;
243 SDL_WaitThread(thread, NULL);
244 SDL_DestroySemaphore(pad_sem);
245 }
246
SDL_SYS_JoystickGetDeviceGUID(int device_index)247 SDL_JoystickGUID SDL_SYS_JoystickGetDeviceGUID( int device_index )
248 {
249 SDL_JoystickGUID guid;
250 /* the GUID is just the first 16 chars of the name for now */
251 const char *name = SDL_SYS_JoystickNameForDeviceIndex( device_index );
252 SDL_zero( guid );
253 SDL_memcpy( &guid, name, SDL_min( sizeof(guid), SDL_strlen( name ) ) );
254 return guid;
255 }
256
SDL_SYS_JoystickGetGUID(SDL_Joystick * joystick)257 SDL_JoystickGUID SDL_SYS_JoystickGetGUID(SDL_Joystick * joystick)
258 {
259 SDL_JoystickGUID guid;
260 /* the GUID is just the first 16 chars of the name for now */
261 const char *name = joystick->name;
262 SDL_zero( guid );
263 SDL_memcpy( &guid, name, SDL_min( sizeof(guid), SDL_strlen( name ) ) );
264 return guid;
265 }
266
267 #endif /* SDL_JOYSTICK_PSP */
268
269 /* vim: ts=4 sw=4
270 */
271